What strikes me the most is the absence of data and research. Has anyone TESTED these behavioral analysis techniques? Is there data? If so, where is it? (Let me guess, it's secret.)

Look at personality testing for example. Although still hugely popular, this has not been shown to be accurate, applicable, or consistent.

Much of what this article describes is too ethereal... "I just had a bad feeling about that guy."

When I taught, I would freak when my students would use these zen observations like, "I could just tell she had a pulmonary embolism." No. You didn't magically sense it: you noticed that she was breathing fast, had changes in her electrocardiogram, and that she was taking an oral contraceptive on a 15-hour flight. A good physician or nurse uses OBJECTIVE data and pieces it together.

A low-facing glance or checking one's pockets isn't reliable, objective information. It's not specific or sensitive to constitute a reliable screening test.